/* Copyright 2012 The Netty Project
 * 
 * The Netty Project licenses this file to you under the Apache License, version 2.0 (the "License"); you may not use
 * this file except in compliance with the License. You may obtain a copy of the License at:
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
 * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations under the License. */
package io.netty.example.qotm;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.Unpooled;
import io.netty.channel.Channel;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.DatagramPacket;
import io.netty.channel.socket.nio.NioDatagramChannel;
import io.netty.util.CharsetUtil;

import java.net.InetSocketAddress;

/**
 * A UDP broadcast client that asks for a quote of the moment (QOTM) to {@link QuoteOfTheMomentServer}. Inspired by <a
 * href="http://docs.oracle.com/javase/tutorial/networking/datagrams/clientServer.html">the official Java tutorial</a>.
 */
public final class QuoteOfTheMomentClient {

	static final int PORT = Integer.parseInt(System.getProperty("port", "7686"));

	public static void main(String[] args) throws Exception {

		EventLoopGroup group = new NioEventLoopGroup();
		try {
			Bootstrap b = new Bootstrap();
			b.group(group).channel(NioDatagramChannel.class).option(ChannelOption.SO_BROADCAST, true)
					.handler(new QuoteOfTheMomentClientHandler());

			Channel ch = b.bind(0).sync().channel();

			// Broadcast the QOTM request to port 8080.
			ch.writeAndFlush(
					new DatagramPacket(Unpooled.copiedBuffer("QOTM?", CharsetUtil.UTF_8), new InetSocketAddress(
							"255.255.255.255", PORT))).sync();

			// QuoteOfTheMomentClientHandler will close the DatagramChannel when a
			// response is received. If the channel is not closed within 5 seconds,
			// print an error message and quit.
			if (!ch.closeFuture().await(5000)) {
				System.err.println("QOTM request timed out.");
			}
		} finally {
			group.shutdownGracefully();
		}
	}
}
